#include <REGX52.H>
#include "Delay.h"

unsigned char Key()
{
	unsigned char key=0;
	if(P3_1==0)
	{
		Delay(20);
		while(P3_1==0);
		Delay(20);
		key=1;
	}
	if(P3_0==0)
	{
		Delay(20);
		while(P3_0==0);
		Delay(20);
		key=2;
	}
	if(P3_2==0)
	{
		Delay(30);
		while(P3_2==0);
		Delay(20);
		key=3;
	}
	if(P3_3==0)
	{
		Delay(20);
		while(P3_3==0);
		Delay(20);
		key=4;
	}
	return key;
}
